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Calculators: Handheld: Texas Instruments TI-1025
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Size (approx): |
70mm
(max) x 140mm x 30mm (max) (w,h,d) |
| Power: | 9.0V DC, 1xPP3 size. Also accepts adapter (AC 9900A) through upper right hand side socket. | |
| Case: | Matt black plastic case with brushed aluminium keyboard surround, mostly tinted light gold. Painted gold logo. | |
| Display: | 8 digit green fluorescent | |
| Features: | Basic memory function with percentages and sign change. Push button on/off control. | |
| Age: | 1977, bought for £6.95 + £0.39 tax on 2 Aug 1977. | |
| Manufacturer: | Texas Instruments, assembled in El Salvador. Serial number 3978. | |
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Comments:
|
Typical bulging Texas shape with shiny key surround. Soft but positive click buttons. Very common calculator. Its contemporary TI-1000 had no memory functions, whilst the bigger TI-1050 had the addition of a square root function. |
| Components: | |
| Boards: | |
| Construction: |
| Logic comments: | Clear entry (CE) clears the last number entered |
| An error results in the display "E.EEEEEEE", overflows are not recoverable | |
| As there is no ninth digit, negative sign sits to the immediate left of a number. You can only have 7-digit negative numbers | |
| There is no indication of memory store - you have to remember it! | |
| Entering a nine digit number has no effect as input is suppressed | |
| The change sign (+/-) function can be used in mid entry of a number | |
| It has an automatic constant, though this is not mentioned in the manual. |
 |
The box on the left does have a
rather odd optical illusion, tending to look as if it's leaning to the
right. Sides and top match the front design, with a list of 15
world-wide service centres on the back.
The box is just about the same size of the calculator - nothing extra was packed with this model. |
|
This manual covers not only the
1025, but the 1000 and 1050 in an impressive nine different
languages. It is one colour 32pp fan-fold format so is obviously
quite brief in its description.
(c) Texas Instruments 1977 Ref: 1015702-1 M. Om 356 507 Ha |
